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Flaky silver-palladium powder as well as preparation method and application thereof

A silver-palladium powder and flake technology, which is applied in the field of flake silver-palladium powder and its preparation, can solve the problems of silver paste loss of electrical conductivity, ion migration, etc., and achieve the reduction of holes, uniform particle size, and optimized dosage Effect

Pending Publication Date: 2022-04-15
成都市天甫金属粉体有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silver paste has good electrical conductivity, but there is a serious problem of ion migration. Silver paste with silver ion migration will lose its electrical conductivity

Method used

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  • Flaky silver-palladium powder as well as preparation method and application thereof
  • Flaky silver-palladium powder as well as preparation method and application thereof
  • Flaky silver-palladium powder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The method for the preparation of the flaky silver-palladium powder of the present embodiment, concrete implementation steps are as follows:

[0040] (1) Preparation of reducing agent solution A: first add 1L of deionized water into the container, then add 1.2g of carboxymethyl cellulose, stir at high speed until the powder is completely dissolved, add 150g of vitamin C, stir and dissolve completely, and prepare a reducing agent solution A, the temperature is controlled at 20-50°C;

[0041] (2) Preparation of silver-containing palladium solution B: the configuration concentration is 0.6mol / L silver nitrate solution, after adding the palladium nitrate solution with a concentration of 0.035mol / L, the mass ratio of silver to palladium is = 10: 1, stirring is completely miscible, The volume of the solution is 1L, and it is configured as a solution B containing silver and palladium, and the temperature is controlled at 20-50°C;

[0042] (3) Prepare the bottom solution C: fi...

Embodiment 2

[0050] In order to verify the impact of palladium nitrate on the final product in this embodiment, in the preparation process, the silver nitrate solution of the same quality was used to replace the mixed solution of silver nitrate and palladium nitrate. Such as figure 2 As shown, the silver powder physical properties are as follows:

[0051] Table two does not add the physical property of the prepared silver powder of palladium nitrate

[0052]

[0053] Depend on figure 2 As can be seen from the data in Table 2, the present embodiment only uses silver nitrate solution to obtain silver powder, but cannot obtain silver palladium powder. The problem of ion migration still exists in pure silver powder. Silver paste.

Embodiment 3

[0055] In order to verify the use of carboxymethyl cellulose as a dispersant in this embodiment, the impact on the preparation of silver palladium powder is carried out as follows:

[0056] Experimental group 1: in the preparation process, gelatin is used instead of carboxymethyl cellulose as a dispersant, and its component is the same as that of carboxymethyl cellulose. Other preparation processes and component consumption are the same as in Example 1. The silver palladium powder particles obtained are as follows: image 3 shown.

[0057] Experimental group 2: in the preparation process, carboxymethyl cellulose is not added, and other preparation processes and component consumption are the same as in Example 1, and the obtained silver palladium powder particles are as follows: Figure 4 shown.

[0058] according to image 3 with Figure 4 It can be seen that gelatin does not have a good dispersion effect as a dispersant, image 3 There is agglomeration phenomenon in the p...

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Abstract

The invention discloses a preparation method of flaky silver-palladium powder, which comprises the following steps: 1) deionized water is used as a solvent, a dispersant is added, vitamin C is added as a solute, a reducing agent solution A is prepared, and the dispersant is carboxymethyl cellulose; 2) adding the silver nitrate solution into the palladium nitrate solution to prepare a silver-containing palladium solution B; (3) preparing a salpeter solution with the pH value of 0.6-1.1, and taking the salpeter solution as a base solution C; and (4) the reducing agent solution A and the silver-containing solution B are added into the base solution C at the same time for a reaction, after the reaction is completed, prepared silver-palladium powder is cleaned, and the silver-palladium powder is obtained after drying. In the preparation process of the silver powder, palladium nitrate is added, and the prepared silver-palladium powder can inhibit anion migration and has more stable conductivity compared with silver powder; in addition, the nucleation mode of the silver-palladium powder is adjusted, the flaky silver-palladium powder is obtained, the flaky powder can be densely stacked better, generation of holes in the sintering process is reduced, and the resistance is smaller.

Description

technical field [0001] The invention relates to the technical field of preparation of conductive silver-palladium powder, in particular to a flaky silver-palladium powder and its preparation method and application. Background technique [0002] Silver palladium powder is the most widely used metal powder in the electronics industry. In recent decades, with the advancement of science and technology, especially the rapid development of the electronics industry, the preparation of silver palladium powder has made considerable progress in both technology and equipment, and has become quite mature. Silver palladium powder is the most critical material to form conductive silver paste, and its quality directly or indirectly affects the performance of the paste and the final conductor. In recent decades, with the rapid development of the microelectronics industry, great progress has been made in the preparation and technological research of precious metal powders, especially silver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B1/02
Inventor 卢红林梁鹏吴杰朱俊杰
Owner 成都市天甫金属粉体有限责任公司
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